Newspace parameters
comment: Compute space of new eigenforms
[N,k,chi] = [1512,2,Mod(757,1512)]
mf = mfinit([N,k,chi],0)
lf = mfeigenbasis(mf)
from sage.modular.dirichlet import DirichletCharacter
H = DirichletGroup(1512, base_ring=CyclotomicField(2))
chi = DirichletCharacter(H, H._module([0, 1, 0, 0]))
N = Newforms(chi, 2, names="a")
//Please install CHIMP (https://github.com/edgarcosta/CHIMP) if you want to run this code
chi := DirichletCharacter("1512.757");
S:= CuspForms(chi, 2);
N := Newforms(S);
| Level: | \( N \) | \(=\) | \( 1512 = 2^{3} \cdot 3^{3} \cdot 7 \) |
| Weight: | \( k \) | \(=\) | \( 2 \) |
| Character orbit: | \([\chi]\) | \(=\) | 1512.c (of order \(2\), degree \(1\), minimal) |
Newform invariants
comment: select newform
sage: f = N[0] # Warning: the index may be different
gp: f = lf[1] \\ Warning: the index may be different
| Self dual: | no |
| Analytic conductor: | \(12.0733807856\) |
| Analytic rank: | \(0\) |
| Dimension: | \(8\) |
| Coefficient field: | 8.0.3317760000.5 |
|
comment: defining polynomial
gp: f.mod \\ as an extension of the character field
|
|
| Defining polynomial: |
\( x^{8} - 7x^{4} + 16 \)
|
| Coefficient ring: | \(\Z[a_1, \ldots, a_{5}]\) |
| Coefficient ring index: | \( 1 \) |
| Twist minimal: | yes |
| Sato-Tate group: | $\mathrm{SU}(2)[C_{2}]$ |
$q$-expansion
comment: q-expansion
sage: f.q_expansion() # note that sage often uses an isomorphic number field
gp: mfcoefs(f, 20)
Coefficients of the \(q\)-expansion are expressed in terms of a basis \(1,\beta_1,\ldots,\beta_{7}\) for the coefficient ring described below. We also show the integral \(q\)-expansion of the trace form.
Basis of coefficient ring in terms of a root \(\nu\) of
\( x^{8} - 7x^{4} + 16 \)
:
| \(\beta_{1}\) | \(=\) |
\( \nu \)
|
| \(\beta_{2}\) | \(=\) |
\( \nu^{2} \)
|
| \(\beta_{3}\) | \(=\) |
\( ( \nu^{6} - 3\nu^{2} ) / 4 \)
|
| \(\beta_{4}\) | \(=\) |
\( ( -\nu^{7} + 7\nu^{3} ) / 8 \)
|
| \(\beta_{5}\) | \(=\) |
\( ( \nu^{5} - 3\nu ) / 2 \)
|
| \(\beta_{6}\) | \(=\) |
\( ( \nu^{7} - 3\nu^{3} ) / 4 \)
|
| \(\beta_{7}\) | \(=\) |
\( \nu^{4} - 4 \)
|
| \(\nu\) | \(=\) |
\( \beta_1 \)
|
| \(\nu^{2}\) | \(=\) |
\( \beta_{2} \)
|
| \(\nu^{3}\) | \(=\) |
\( \beta_{6} + 2\beta_{4} \)
|
| \(\nu^{4}\) | \(=\) |
\( \beta_{7} + 4 \)
|
| \(\nu^{5}\) | \(=\) |
\( 2\beta_{5} + 3\beta_1 \)
|
| \(\nu^{6}\) | \(=\) |
\( 4\beta_{3} + 3\beta_{2} \)
|
| \(\nu^{7}\) | \(=\) |
\( 7\beta_{6} + 6\beta_{4} \)
|
Character values
We give the values of \(\chi\) on generators for \(\left(\mathbb{Z}/1512\mathbb{Z}\right)^\times\).
| \(n\) | \(757\) | \(785\) | \(1081\) | \(1135\) |
| \(\chi(n)\) | \(-1\) | \(1\) | \(1\) | \(1\) |
Embeddings
For each embedding \(\iota_m\) of the coefficient field, the values \(\iota_m(a_n)\) are shown below.
For more information on an embedded modular form you can click on its label.
comment: embeddings in the coefficient field
gp: mfembed(f)
| Label | \(\iota_m(\nu)\) | \( a_{2} \) | \( a_{3} \) | \( a_{4} \) | \( a_{5} \) | \( a_{6} \) | \( a_{7} \) | \( a_{8} \) | \( a_{9} \) | \( a_{10} \) | ||||||||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 757.1 |
|
−1.40294 | − | 0.178197i | 0 | 1.93649 | + | 0.500000i | 0.356394i | 0 | −1.00000 | −2.62769 | − | 1.04655i | 0 | 0.0635083 | − | 0.500000i | ||||||||||||||||||||||||||||||||||
| 757.2 | −1.40294 | + | 0.178197i | 0 | 1.93649 | − | 0.500000i | − | 0.356394i | 0 | −1.00000 | −2.62769 | + | 1.04655i | 0 | 0.0635083 | + | 0.500000i | ||||||||||||||||||||||||||||||||||
| 757.3 | −0.178197 | − | 1.40294i | 0 | −1.93649 | + | 0.500000i | 2.80588i | 0 | −1.00000 | 1.04655 | + | 2.62769i | 0 | 3.93649 | − | 0.500000i | |||||||||||||||||||||||||||||||||||
| 757.4 | −0.178197 | + | 1.40294i | 0 | −1.93649 | − | 0.500000i | − | 2.80588i | 0 | −1.00000 | 1.04655 | − | 2.62769i | 0 | 3.93649 | + | 0.500000i | ||||||||||||||||||||||||||||||||||
| 757.5 | 0.178197 | − | 1.40294i | 0 | −1.93649 | − | 0.500000i | 2.80588i | 0 | −1.00000 | −1.04655 | + | 2.62769i | 0 | 3.93649 | + | 0.500000i | |||||||||||||||||||||||||||||||||||
| 757.6 | 0.178197 | + | 1.40294i | 0 | −1.93649 | + | 0.500000i | − | 2.80588i | 0 | −1.00000 | −1.04655 | − | 2.62769i | 0 | 3.93649 | − | 0.500000i | ||||||||||||||||||||||||||||||||||
| 757.7 | 1.40294 | − | 0.178197i | 0 | 1.93649 | − | 0.500000i | 0.356394i | 0 | −1.00000 | 2.62769 | − | 1.04655i | 0 | 0.0635083 | + | 0.500000i | |||||||||||||||||||||||||||||||||||
| 757.8 | 1.40294 | + | 0.178197i | 0 | 1.93649 | + | 0.500000i | − | 0.356394i | 0 | −1.00000 | 2.62769 | + | 1.04655i | 0 | 0.0635083 | − | 0.500000i | ||||||||||||||||||||||||||||||||||
Inner twists
| Char | Parity | Ord | Mult | Type |
|---|---|---|---|---|
| 1.a | even | 1 | 1 | trivial |
| 3.b | odd | 2 | 1 | inner |
| 8.b | even | 2 | 1 | inner |
| 24.h | odd | 2 | 1 | inner |
Twists
| By twisting character orbit | |||||||
|---|---|---|---|---|---|---|---|
| Char | Parity | Ord | Mult | Type | Twist | Min | Dim |
| 1.a | even | 1 | 1 | trivial | 1512.2.c.c | ✓ | 8 |
| 3.b | odd | 2 | 1 | inner | 1512.2.c.c | ✓ | 8 |
| 4.b | odd | 2 | 1 | 6048.2.c.c | 8 | ||
| 8.b | even | 2 | 1 | inner | 1512.2.c.c | ✓ | 8 |
| 8.d | odd | 2 | 1 | 6048.2.c.c | 8 | ||
| 12.b | even | 2 | 1 | 6048.2.c.c | 8 | ||
| 24.f | even | 2 | 1 | 6048.2.c.c | 8 | ||
| 24.h | odd | 2 | 1 | inner | 1512.2.c.c | ✓ | 8 |
| By twisted newform orbit | |||||||
|---|---|---|---|---|---|---|---|
| Twist | Min | Dim | Char | Parity | Ord | Mult | Type |
| 1512.2.c.c | ✓ | 8 | 1.a | even | 1 | 1 | trivial |
| 1512.2.c.c | ✓ | 8 | 3.b | odd | 2 | 1 | inner |
| 1512.2.c.c | ✓ | 8 | 8.b | even | 2 | 1 | inner |
| 1512.2.c.c | ✓ | 8 | 24.h | odd | 2 | 1 | inner |
| 6048.2.c.c | 8 | 4.b | odd | 2 | 1 | ||
| 6048.2.c.c | 8 | 8.d | odd | 2 | 1 | ||
| 6048.2.c.c | 8 | 12.b | even | 2 | 1 | ||
| 6048.2.c.c | 8 | 24.f | even | 2 | 1 | ||
Hecke kernels
This newform subspace can be constructed as the intersection of the kernels of the following linear operators acting on \(S_{2}^{\mathrm{new}}(1512, [\chi])\):
|
\( T_{5}^{4} + 8T_{5}^{2} + 1 \)
|
|
\( T_{17}^{2} - 10 \)
|
Hecke characteristic polynomials
| $p$ | $F_p(T)$ |
|---|---|
| $2$ |
\( T^{8} - 7T^{4} + 16 \)
|
| $3$ |
\( T^{8} \)
|
| $5$ |
\( (T^{4} + 8 T^{2} + 1)^{2} \)
|
| $7$ |
\( (T + 1)^{8} \)
|
| $11$ |
\( (T^{4} + 48 T^{2} + 441)^{2} \)
|
| $13$ |
\( (T^{4} + 32 T^{2} + 196)^{2} \)
|
| $17$ |
\( (T^{2} - 10)^{4} \)
|
| $19$ |
\( (T^{4} + 62 T^{2} + 1)^{2} \)
|
| $23$ |
\( (T^{4} - 8 T^{2} + 1)^{2} \)
|
| $29$ |
\( (T^{2} + 6)^{4} \)
|
| $31$ |
\( (T + 7)^{8} \)
|
| $37$ |
\( (T^{4} + 38 T^{2} + 121)^{2} \)
|
| $41$ |
\( (T^{4} - 152 T^{2} + 5041)^{2} \)
|
| $43$ |
\( (T^{4} + 80 T^{2} + 100)^{2} \)
|
| $47$ |
\( (T^{2} - 54)^{4} \)
|
| $53$ |
\( T^{8} \)
|
| $59$ |
\( (T^{4} + 212 T^{2} + 7396)^{2} \)
|
| $61$ |
\( (T^{4} + 192 T^{2} + 576)^{2} \)
|
| $67$ |
\( (T^{4} + 288 T^{2} + 15876)^{2} \)
|
| $71$ |
\( (T^{4} - 48 T^{2} + 441)^{2} \)
|
| $73$ |
\( (T^{2} + 6 T - 6)^{4} \)
|
| $79$ |
\( (T^{2} - 2 T - 134)^{4} \)
|
| $83$ |
\( (T^{4} + 212 T^{2} + 7396)^{2} \)
|
| $89$ |
\( (T^{4} - 152 T^{2} + 5041)^{2} \)
|
| $97$ |
\( (T^{2} + 4 T - 56)^{4} \)
|
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